these people -- dzhokhar and tamerlan were not isolated. they had a lot of friends and people their lives and the fbi wants to question the widow of the suspected bomber, catherine russell of tamerlan tsarnaev. they were married in 2010 and authorities search for answers and family and friends are crucial to the investigation. and according to her attorney, though, she didn't know anything about the bombings and was devastated to hear her husband maybe involved. is it more complicated than that, though? chris lawrence is in north kingston, rhode island, tonight. what do investigators want to hear from catherine russell? >> reporter: erin, federal authorities want to know what, if anything, catherine russell knows about what her husband was doing before the bombing, and what affiliations he may have had other than his younger brother. the attorney told me bottom line she is cooperating with federal authorities and that she didn't know anything about what was going on until she actually saw it on the news. he said she understands why federal